Dictating

In manner very similar to thumbing when the orgasm begins theruinater simply places the tip of the forefinger of the idle or less active hand
over the escaping fluid until the hole is blocked tight.

This
method needs some practice to master because squirming on the part of
the one attached to the cock can break the seal if not careful.

Foreign Dictating
aka Popper Stoppers

This
method obviously derives from dictating but a foreign object is introduced either during the session or brought in suddenly for shock value and i used to block the stream of ejaculate. This can be most unsatisfying and sometimes painful.
A cube of ice, the end of a dildo, a shoe or an ordinary shotglass are examples.
Foreign dictating does not include the act of insertion.(see Dutching)

Poppers
Stoppers are a highly annoying way to have an orgasm ruined as it
usually means the end of human touch on the penis as some object that
is nearby is placed in the path of the ejaculate forcing it to stop
leaving the body completely. This is usually accompanyied with cackles
and hoots of laughter on her part.

Scrunching

This is when the head or upper part of the cock is taken in hand or between multiple fingers and squeezed or "scrunched"
as to not let any ejaculate flow freely. If held long enough the orgasm
will not reach maturity and therefore be very awkward and uncomfortable.

Precision is not a requisite with this method only a tight grip is needed so its perfect for the rookie or if you are wearing some sort of thick gloves.

In
this CBT manuever just as the orgasm erupts the ruinater uses their
hand and smacks the sensitive underside of the cock with a hard and
fast strike. If done correctly the blow will cause the cock to enter a
sort of self defense mode and shut down all currently running orgasms.

Squelching

This method has the same theory and effect as scrunching but the pressure is applied to the ballsack and then had against the base of the cock cutting off all semen and all pleasure.

Post Orgasm Cock Torture Many
people confuse this with a ruined orgasm but it is in most respects the
opposite because the orgasm itself is undeterred and normally very
pleasurable. The fact that the hand continues to manipulate the cock
after the orgasm is complete does not contribute in any way to a
"ruined" orgasm.